Recoil Direction on SMGs and MGs

After someone posted this thread on reddit showing that Left and Right add different muzzle attachments (and confirming my suspicion that there was something wrong with all the MGs having the "cone" flash hider, which had always bothered me), I went in-game to confirm exactly what was wrong (Left/Centered attachment models got swapped on MGs, SMGs are fine) I also actually tested out how much they affect the gun, something I'd really never bothered touching until now.

I did do a quick search to see if we figured this out, but only got a thread vaguely explaining the idea, no numbers; I've also never seen any numbers brought up that I can remember. Do we know what exactly the Left/Right options do, specifically? All my subjective, "feels" experience is telling me is that they really don't make much difference.

Prepare your laughbox

the Sebstalder is quiet good since it can 3hit kill at any distanc ,but In my opinion i actually thikn the sweeper is better, its got a really really fast firerate that can beat alll those Noobmaticos, Helregall adn shitguns in close quarters , and its also really accurate out to like l;ong range,. overall great allround gun, jsut my 2$ tho